diff --git a/pkgs/development/compilers/crystal/default.nix b/pkgs/development/compilers/crystal/default.nix
index b2b92908f95..3c6f3693401 100644
--- a/pkgs/development/compilers/crystal/default.nix
+++ b/pkgs/development/compilers/crystal/default.nix
@@ -73,6 +73,7 @@ let
 
     FLAGS = [
       "--release"
+      "--no-debug"
       "--single-module" # needed for deterministic builds
     ];